Reverberation nulling and echo enhancement at low frequency using waveguide invariance
Reverberation nulling and echo enhancement at low frequency using waveguide invariance
复制标题
利用波导不变性实现低频混响归零和回声增强
DOI：
10.1007/s11434-010-4207-z
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发表时间：
2011-01
影响因子：
--
通讯作者：
Sun Chao
中科院分区：
文献类型：
--
作者：
Guo GuoQiang;Yang YiXin;Sun Chao
基于某一距离上的源-接收器阵列与边界混响的主要散射体之间的传递函数矢量可以从该距离单元散射的相应混响信号中得到的事实，提出了一种利用时间反转处理的混响对零概念。然而，现有的混响置零方法在实际应用中存在一定的局限性，往往会使边界混响和目标回波同时置零。作为解决方案，本文提出了一种利用波导不变性的低频无源混响抵消和回波增强方法。该方法不是直接从目标距离单元散射的回波信号中得到目标距离单元的混响子空间，而是利用波导不变性从位于目标前的距离单元散射的回波信号中得到目标距离单元的混响子空间，从而通过被动混响置零来抑制目标回波中的混响。此外，还推导了与距离相关的最优加权向量，而不是传统的投影矩阵，使混响分量归零，同时最大化目标回波，从而最大限度地提高了回声混响比。典型的距离无关浅海环境下的数值仿真结果表明了该方法的有效性和改善了回波混响增强的性能。
Based on the fact that the transfer function vector between a source receiver array and the dominant scatterer of boundary reverberation at a range can be obtained from the corresponding reverberations scattered from this range cell, a reverberation nulling concept using time reversal processing has been proposed. However, current reverberation nulling methods have certain limitations when applied into practice, which would null boundary reverberation and target echo simultaneously. As a solution, a passive reverberation nulling and echo enhancement method at low frequency using waveguide invariance is proposed in this paper. In this method, the reverberation subspace for the target range cell is not obtained directly from the return signals scattered by the target range cell but from the return signals scattered by a range cell located before the target using waveguide invariance, so as to suppress the reverberation embodied in the target echo by passive reverberation nulling. Besides, a range-dependent optimal weighting vector rather than conventional projector matrix is deduced to null the reverberation component meanwhile maximizing the target echo, thereby enhancing the echo-to-reverberation ratio furthest. Numerical simulations in typical range-independent shallow water environment demonstrate the efficacy and the improved performance of the proposed method for echo-to-reverberation enhancement.
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DOI：
--
发表时间：
2008
期刊：
MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)
影响因子：
--
作者：
H. C. Song;W. Hodgkiss;W. Kuperman;K. Sabra;T. Akal;M. Stevenson
通讯作者：
H. C. Song;W. Hodgkiss;W. Kuperman;K. Sabra;T. Akal;M. Stevenson
影响因子：
2.4
作者：
S. Walker;W. Kuperman;P. Roux
通讯作者：
S. Walker;W. Kuperman;P. Roux
影响因子：
2.4
作者：
L. Brekhovskikh;Y. Lysanov
通讯作者：
L. Brekhovskikh;Y. Lysanov
影响因子：
2.4
作者：
Hee-Chun Song;W. Kuperman;W. Hodgkiss
通讯作者：
Hee-Chun Song;W. Kuperman;W. Hodgkiss
DOI：
10.1007/978-1-4419-8678-8_1
发表时间：
2011-01-01
期刊：
COMPUTATIONAL OCEAN ACOUSTICS, SECOND EDITION
影响因子：
--
作者：
Jensen, Finn B.;Kuperman, William A.;Schmidt, Henrik
通讯作者：
Schmidt, Henrik